JPS5828448A - Tool cramping device - Google Patents

Abstract

PURPOSE:To suppress the space and cost by operating the tool cramp mechanism, furnished at the side end of the spindle, through utilization of revilving motion of the tool replacement arm and thereby eliminating provision of any cylinder solely used for tool cramping. CONSTITUTION:In order to set or remove a tool fitting part 11 on/from the tool driving spindle 7 by the use of a tool replacement arm 6, a lock shaft 20, which can move in the direction perpendicular to the axis of the spindle 7 and be put in engagement separably with the fitting part 11 of a tool 4, and a swing piece 21, which moves this lock shaft 20 axially forward and backward, are furnished at the side of the foremost part of spindle on which the tool fitting part 11 is fitted. This swing piece 21 is turned following the revolving motion of the arm 6 at the time of tool replacement actuated by an engagement pin 25 provided on the tool replacement arm 6, and this turn will move the abovementioned lock shaft 20 axially forward and backward. Thus the tool fitting part 11 is set or removed on/from the spindle 7.

Description

[Detailed description of the invention] It is related to.

An object of the present invention is to utilize the pivoting movement of the tool exchange arm to ensure clamping of the tool.

A further object of the present invention is to make it possible to clamp a tool fitted to a main shaft in which a drive rod for operating the tool is installed.

For tools in which the taper part of the tool is fitted to the main shaft, conventional tool clamping devices have a structure in which a stud bolt is provided at the rear end of the tool, and the stand bolt is pulled in and clamped by an operating rod built into the main shaft. Met. Therefore, a dedicated cylinder is required to move the operating rod forward and backward.

In the case of tools with gripping claws, such as handling tools, a drive rod is built into the main shaft to open and close the gripping claws. Such a tool cannot be used with the conventional clamping device as described above because the stud bolt gets in the way.

The present invention provides a tool clamping device that solves the above-mentioned conventional problems. The tool exchange arm is provided with an engagement pin that engages with the swing arm, and the tool is clamped and unclamped by pivoting the tool exchange arm that attaches and detaches the tool from the main shaft.

Embodiments of the present invention will be described below based on the drawings.

1 and 2 show an example of an article transfer device to which the device of the present invention is applied, in which 1 is a base, 2 is an article assembly table provided on the base 1, and 3 is an article transfer device. This is an attachment/detachment device that moves on the base 1 between the tool storage magazine 5 and the article assembly table 2 along the guide surface 1a. The article loading/unloading device 3 has a sliding sleeve 17 that is slidable in a direction perpendicular to the moving direction of the article loading/unloading device 3, and a main shaft 7 is rotatably mounted on the sliding sleeve 17. A handling tool 4 is fitted to the tip. Reference numeral 6 denotes a tool exchange arm for exchanging the handling tool 4 between the tool storage magazine 5 and the main spindle 7, and it performs axial forward and backward movement and turning movement by a well-known drive device.

The handling tool 4 is provided with gripping claws that can be opened and closed according to the shape of the article to grip the article, for example, as shown in FIGS. 3 and 4. In this structural example, a gripping claw 9 is guided and supported by a guide rod 8 so as to be openable and closable. A rack 10 extending in the axial direction of the guide rod 8 is integrally attached to the gripping claw 9, and a pinion 14 is meshed with the rack 10. The rotation mechanism of the pinion 14 is such that rotation is transmitted via a gear mechanism from a transmission shaft 13 installed in the mounting part 11 that connects the tapered fitting surface, and the transmission shaft 13 is installed inside the main shaft 7. The rotation of the driving iron 18 is transmitted through connection with the driving iron 18 that has been rotated.

The means for connecting the driving iron 18 and the transmission shaft 13 is a clutch member 19 fixed to the tip of the driving iron 18 and the transmission shaft 1.
The clutch member 1 is spline-fitted to the tip of the clutch member 1.
9 and a clutch member 15 that meshes with each other, forming a so-called clutch mechanism. Reference numeral 16 denotes a rotation stop pin of the clutch member 15, which allows rotation when the clutch member 15 is engaged with the clutch member 19, and when the mounting portion 11 of the tool 4 is pulled out from the main shaft 7, the clutch member 1
5 is pressed and moved by a spring 28 to restrict the rotation of the clutch member 15 and lock the gripping claws 9 from opening and closing.

Reference numeral 12 denotes a grip portion held by the tool exchange arm 6, and 24 represents a key protruding from the tip of the main shaft 7, which is engaged in a key groove of the grip portion 12.

A lock shaft 2°, which is movable in a direction perpendicular to the axis of the main shaft 7, is provided at the distal end side of the main shaft 7 into which the mounting portion 11 of the handling tool 4 as described above is fitted. This lock shaft 20 is adapted to be engaged with an engagement recess 29 provided in the mounting portion 11 of the handling tool 4 by moving forward or backward, or to be disengaged from this engagement recess 29.

The lock shaft 20 is provided with a swinging member 21 that is rotatable about the axis of the lock shaft 20 for moving the lock shaft 20 forward and backward. Lock shaft 20 by rotation of rocker 21
The forward/backward axis movement mechanism is provided with a cam groove 23 on the outer peripheral surface of the rocking member 21, which gradually slopes as the rocking member 2 rotates.
It has a structure in which a fixed engagement pin 22 is engaged with the rocking member 2.
An axial displacement due to the rotation of the lock shaft 20 is applied to the lock shaft 20. Reference numeral 26 indicates an auxiliary lock bin, and 27 indicates a detent mechanism for maintaining the rotational position of the swinging member 21.

Note that in normal cases, the axial movement of this rocking member 21 is transmitted to the lock shaft 20 via the spring 20B, but if there are variations in the dimensions of the engagement recess 29, the lock shaft 2o may be moved by a gap e. The amount of protrusion changes to cope with the above dimensional error, and the amount of protrusion of the lock shaft 20 is adjusted to the clearance 4.
When the lock shaft 20 changes above, it comes into contact with the cap 21a and actively prevents the lock shaft 20 from retreating.

On the other hand, the tool exchange arm 6 is provided with a protruding engagement pin 25 that engages with the rocker 21, and the tool exchange arm 6 is connected to the main shaft 7.
In the direction of approaching the main shaft 7, the rocking member 21 is rotated in the unclamping direction in which the lock shaft 20 moves backward, and in the swinging away from the main shaft 7, the rocking member 21 is rotated in the clamping direction in which the lock shaft 20 is moved forward. be.

Next, the operation of the device of the present invention will be explained.

3 and 4 show the handling tool 4 in a clamped state. That is, the lock shaft member moves forward and engages with the engagement recess 29 of the mounting portion 11 fitted to the tip of the main shaft 7, restraining the movement of the mounting portion 11 in the axial direction, and wedges the mounting portion 11. It's pulling in the same direction. Also, drive rod 1
The clutch member 19 at the 8th end and the clutch member 15 at the end of the transmission shaft 13 of the handling tool 4 are engaged with each other, and the gripping claws 9 are opened and closed by the left and right rotation of the driving iron 18 via a gear mechanism or the like.

On the other hand, as is well known, the operation of the tool changing arm 6 is as follows:
It performs forward and backward movement and turning movement in the direction parallel to the axis of. That is, a turning motion of approaching and separating from the main shaft 7, and an axial forward and backward motion of attaching and detaching the tool at a position approaching the main shaft 7.

Therefore, to explain the operation of extracting the handling tool 4 clamped to the main spindle 7 shown in FIGS. 4 and approaches the main shaft 7 in order to grasp the gripping portion 12. At this time, the engagement pin 25 engages with the swinging piece 21 which is in the clamped state shown by the solid line in FIG. 4, and rotates the swinging piece 21 into the unclamped state shown by the imaginary line. As a result, the lock shaft 20 is connected to the cam groove 2.
3 and the engagement pin 22, the lock shaft 20 is moved in the backward axis, and the lock shaft 20 is disengaged from the engagement recess 29 of the mounting portion 11 to release the clamp. Thereafter, the tool exchange arm 6 that gripped the handling tool 4 moves forward in the axial direction to extract the attachment part 11 of the handling tool 4 from the main shaft 7, and then rotates 180 degrees and extracts the hand walking tool 4 from the main shaft 7. is located in the tool storage magazine 5, and positions the handling tool to be installed next after being extracted from the tool storage magazine 5 on the axis of the main spindle 7. Subsequently, the tool exchange arm 6 attaches the handling tool on the spindle 7 side to the spindle 7, and moves the handling tool on the tool storage magazine 5 side backward in the axial direction to store it in the tool storage magazine 5.

The handling tool to be mounted on the main shaft 7 engages with the mounting portion 11 since the lock shaft 20 maintains the unclamped state of the backward shaft movement when the tool is removed. Then, the tool changing arm 6 pivots to return to its original position at the fitting diameter of the mounting portion 11, and through this pivoting movement, the engaging pin 25 moves the swinging piece 21 to the clamped position shown by the solid line in FIG. The lock shaft 20 is rotated and moved in a forward axis to engage the engagement recess 29 of the mounting portion 11 to clamp the handling tool 4 fitted to the main shaft 7.

As described above, the device of the present invention operates the tool clamping mechanism provided at the end of the spindle by utilizing the rotational movement of the tool change arm when the tool is attached to and removed from the spindle by the tool change arm. This eliminates the need for a cylinder device dedicated to tool clamping as in the past, which is advantageous in terms of space and cost, and also makes it possible to clamp tools, especially when the shaft has a driving rod for the handling tool. There are advantages.

In addition, the locking shaft, which is converted into forward and backward axis movement by the swinging piece that rotates with the rotational movement of the tool exchange arm and engages and clamps the four engaging parts of the tool mounting part, enters into the engaging recess. When doing so, it acts to pull the mounting part in the wedge direction, and has the advantage of firmly and correctly fitting the mounting part to the main shaft.

[Brief explanation of the drawing]

Figure 1 is a front view of an article transfer device showing an example to which the present invention is applied, Figure 2 is Figure 1 N-1, and Figures 3 to 1 are Figure 1.
FIG. N-1 is a sectional view showing the main parts of the device of the present invention. FIG. 4 is a broken sectional view taken in the direction of the arrow ■ in FIG. 3. 4... Handling tool, 6... Tool exchange arm,
7... Main shaft, 11... Mounting part, 20... Lock shaft, 21... Rocking piece, 25... Engaging pin. Patent applicant Makoto Ishizaka, Director of the Institute of Industrial Science and Technology −

Claims (1)

[Claims] In a spindle equipped with a drive rod for tool operation, a tool mounting part is fitted onto and removed from the tool exchange arm using a hole, and the axis of the main shaft is attached to the tip side of the spindle where the tool mounting part is fitted. a lock shaft that is movable in a direction orthogonal to the tool and that is engageable and detachable from the mounting portion of the tool; and a swing arm that moves the lock shaft forward and backward;
A tool clamping device characterized in that an engaging pin is provided in a protruding manner to rotate the swinging arm by a pivoting movement for attaching and detaching a tool to and from a main shaft.